ob·liv·i·ous

[uh-bliv-ee-uhs]
adjective
1.
unmindful; unconscious; unaware (usually followed by of or to ): She was oblivious of his admiration.
2.
forgetful; without remembrance or memory: oblivious of my former failure.
3.
Archaic. inducing forgetfulness.

Origin:
1400–50; late Middle English < Latin oblīviōsus forgetful, equivalent to oblīvī(scī) to for-get + -ōsus -ous

ob·liv·i·ous·ly, adverb
ob·liv·i·ous·ness, noun
self-ob·liv·i·ous, adjective
sem·i·ob·liv·i·ous, adjective
sem·i·ob·liv·i·ous·ly, adverb
sem·i·ob·liv·i·ous·ness, noun
un·ob·liv·i·ous, adjective
un·ob·liv·i·ous·ly, adverb
un·ob·liv·i·ous·ness, noun

oblivious, obvious.


2. See absent-minded.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
oblivious (əˈblɪvɪəs) [Click for IPA pronunciation guide]
 
adj (foll by to or of)
unaware or forgetful
 
usage  It was formerly considered incorrect to use oblivious to mean unaware, but this use is now acceptable
 
ob'liviously
 
adv
 
ob'liviousness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

oblivious
mid-15c., from L. obliviosus "forgetful, producing forgetfulness," from oblivionem (see oblivion). Meaning "unaware, unconscious (of something)" is from 1862, formerly regarded as erroneous, this is now the general meaning and the word has lost its original sense of "no
longer aware or mindful." Properly should be used with to, not of.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
They're completely oblivious to how much they're repulsing everybody around
  them.
But he lies on his side, smiling, oblivious of the pain.
Chavez is also oblivious as to governments true role in development towards
  prosperity.
Even though the atmosphere said no, the oblivious team leader said yes.
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